CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
24.1%
Successful exploitation of these vulnerabilities could allow an attacker to access the web application, inject arbitrary code, execute malicious code, obtain sensitive information, or execute a malicious request.
The following versions of Lynx 206-F2G, a layer three industrial Ethernet switch, are affected:
3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION (‘CROSS-SITE SCRIPTING’) CWE-79
An attacker with access to the web application that has the vulnerable software could introduce arbitrary JavaScript by injecting a cross-site scripting payload into the “forward.0.domain” parameter.
CVE-2023-40143 has been assigned to this vulnerability. A CVSS v3.1 base score of 5.4 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N).
3.2.2 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION (‘CROSS-SITE SCRIPTING’) CWE-79
An attacker with access to the web application that has the vulnerable software could introduce arbitrary JavaScript by injecting a cross-site scripting payload into the “autorefresh” parameter.
CVE-2023-45222 has been assigned to this vulnerability. A CVSS v3.1 base score of 5.4 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N).
3.2.3 IMPROPER CONTROL GENERATION OF CODE (‘CODE INJECTION’) CWE-94
A potential attacker with access to the device would be able to execute malicious code that could affect the correct functioning of the device.
CVE-2023-45735 has been assigned to this vulnerability. A CVSS v3.1 base score of 8.0 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H).
3.2.4 CROSS-ORIGIN RESOURCE SHARING (CORS) CWE-942
A potential attacker with access to the device would be able to execute malicious code that could affect the correct functioning of the device.
CVE-2023-45213 has been assigned to this vulnerability. A CVSS v3.1 base score of 6.5 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N).
3.2.5 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION (‘CROSS-SITE SCRIPTING’) CWE-79
An attacker with access to the vulnerable software could introduce arbitrary JavaScript by injecting a cross-site scripting payload into the “username” parameter in the SNMP configuration.
CVE-2023-42765 has been assigned to this vulnera or craft a malicious request.bility. A CVSS v3.1 base score of 5.4 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N).
3.2.6 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION (‘CROSS-SITE SCRIPTING’) CWE-319
An attacker with access to the network where the affected devices are located could maliciously actions to obtain, via a sniffer, sensitive information exchanged via TCP communications.
CVE-2023-40544 has been assigned to this vulnerability. A CVSS v3.1 base score of 5.7 has been calculated; the CVSS vector string is (AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N).
3.2.7 CROSS-SITE REQUEST FORGERY (CSRF) CWE-352
The cross-site request forgery token in the request may be predictable or easily guessable allowing attackers to craft a malicious request, which could be triggered by a victim unknowingly. In a successful CSRF attack, the attacker could lead the victim user to carry out an action unintentionally.
CVE-2023-38579 has been assigned to this vulnerability. A CVSS v3.1 base score of 8.0 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H).
3.2.8 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION (‘CROSS-SITE SCRIPTING’) CWE-79
An attacker with access to the web application with vulnerable software could introduce arbitrary JavaScript by injecting a cross-site scripting payload into the “dns.0.server” parameter.
CVE-2023-45227 has been assigned to this vulnerability. A CVSS v3.1 base score of 5.4 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N).
Aarón Flecha Menéndez, Iván Alonso Álvarez and Víctor Bello Cuevas reported these vulnerabilities to CISA.
Westermo recommends following best practices for hardening, such as restricting access, disable unused services (attack surface reduction), etc., to mitigate the reported vulnerabilities.
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities, such as:
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-40143
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-42765
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-45213
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-45222
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-45735
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-CVE-2023-38579
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-CVE-2023-40544
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-CVE-2023-45227
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-24-023-04
cwe.mitre.org/data/definitions/319.html
cwe.mitre.org/data/definitions/352.html
cwe.mitre.org/data/definitions/79.html
cwe.mitre.org/data/definitions/79.html
cwe.mitre.org/data/definitions/79.html
cwe.mitre.org/data/definitions/79.html
cwe.mitre.org/data/definitions/94.html
cwe.mitre.org/data/definitions/942.html
github.com/cisagov/CSAF
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Westermo%20Lynx%20206-F2G+https://www.cisa.gov/news-events/ics-advisories/icsa-24-023-04
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.cisa.gov/resources-tools/resources/ics-recommended-practices
www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf
www.cisa.gov/topics/industrial-control-systems
www.cisa.gov/topics/industrial-control-systems
www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
www.cisa.gov/uscert/ncas/tips/ST04-014
www.cisa.gov/uscert/sites/default/files/publications/emailscams0905.pdf
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
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CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
24.1%